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Continental-scale temperature variability during the past two millennia

(2013) NATURE GEOSCIENCE. 6(5). p.339-346
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Abstract
Past global climate changes had strong regional expression. To elucidate their spatial-temporal pattern, we reconstructed past temperatures for seven continental-scale regions during the last one to two millennia. The most coherent feature in nearly all of the regional temperature reconstructions is a long-term cooling trend, which ended late in the 19th century. At multi-decadal to centennial scales, temperature variability shows distinctly different regional patterns, with more similarity within each hemisphere than between them. There were no globally synchronous multi-decadal warm or cold intervals that define a worldwide Medieval Warm Period or Little Ice Age, but all reconstructions show generally cold conditions between 1580 and 1880 CE, punctuated in some regions by warm decades during the 18th century. The transition to these colder conditions occurred earlier in the Arctic, Europe and Asia than in North America or the Southern Hemisphere regions. Recent warming reversed the long-term cooling; during the last 30-year period (1971-2000 CE), the area-weighted average reconstructed temperature was likely higher than anytime in nearly 1400 years.
Keywords
SIMULATIONS, RESOLUTION, CLIMATE, RECONSTRUCTIONS, STATISTICAL SIGNIFICANCE, NORTHERN-HEMISPHERE, ICE-AGE, LAST MILLENNIUM, EVOLUTION, CENTURIES

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Citation

Please use this url to cite or link to this publication:

Chicago
Ahmed, Moinuddin, Kevin J Anchukaitis, Asfawossen Asrat, Hemant P Borgaonkar, Martina Braida, Brendan M Buckley, Ulf Büntgen, et al. 2013. “Continental-scale Temperature Variability During the Past Two Millennia.” Nature Geoscience 6 (5): 339–346.
APA
Ahmed, Moinuddin, Anchukaitis, K. J., Asrat, A., Borgaonkar, H. P., Braida, M., Buckley, B. M., Büntgen, U., et al. (2013). Continental-scale temperature variability during the past two millennia. NATURE GEOSCIENCE, 6(5), 339–346.
Vancouver
1.
Ahmed M, Anchukaitis KJ, Asrat A, Borgaonkar HP, Braida M, Buckley BM, et al. Continental-scale temperature variability during the past two millennia. NATURE GEOSCIENCE. 2013;6(5):339–46.
MLA
Ahmed, Moinuddin, Kevin J Anchukaitis, Asfawossen Asrat, et al. “Continental-scale Temperature Variability During the Past Two Millennia.” NATURE GEOSCIENCE 6.5 (2013): 339–346. Print.
@article{4091838,
  abstract     = {Past global climate changes had strong regional expression. To elucidate their spatial-temporal pattern, we reconstructed past temperatures for seven continental-scale regions during the last one to two millennia. The most coherent feature in nearly all of the regional temperature reconstructions is a long-term cooling trend, which ended late in the 19th century. At multi-decadal to centennial scales, temperature variability shows distinctly different regional patterns, with more similarity within each hemisphere than between them. There were no globally synchronous multi-decadal warm or cold intervals that define a worldwide Medieval Warm Period or Little Ice Age, but all reconstructions show generally cold conditions between 1580 and 1880 CE, punctuated in some regions by warm decades during the 18th century. The transition to these colder conditions occurred earlier in the Arctic, Europe and Asia than in North America or the Southern Hemisphere regions. Recent warming reversed the long-term cooling; during the last 30-year period (1971-2000 CE), the area-weighted average reconstructed temperature was likely higher than anytime in nearly 1400 years.},
  author       = {Ahmed, Moinuddin and Anchukaitis, Kevin J and Asrat, Asfawossen and Borgaonkar, Hemant P and Braida, Martina and Buckley, Brendan M and B{\"u}ntgen, Ulf and Chase, Brian M and Christie, Duncan A and Cook, Edward R and Curran, Mark AJ and Diaz, Henry F and Esper, Jan and Fan, Ze-Xin and Gaire, Narayan P and Ge, Quansheng and Gergis, Jo{\"e}lle and Gonz{\'a}lez-Rouco, J Fidel and Goosse, Hugues and Grab, Stefan W and Graham, Nicholas and Graham, Rochelle and Grosjean, Martin and Hanhij{\"a}rvi, Sami T and Kaufman, Darrell S and Kiefer, Thorsten and Kimura, Katsuhiko and Korhola, Atte A and Krusic, Paul J and Lara, Antonio and L{\'e}zine, Anne-Marie and Ljungqvist, Fredrik C and Lorrey, Andrew M and Luterbacher, J{\"u}rg and Masson-Delmotte, Valerie and McCarroll, Danny and McConnell, Joseph R and McKay, Nicholas P and Morales, Mariano S and Moy, Andrew D and Mulvaney, Robert and Mundo, Ignacio A and Nakatsuka, Takeshi and Nash, David J and Neukom, Raphael and Nicholson, Sharon E and Oerter, Hans and Palmer, Jonathan G and Phipps, Steven J and Prieto, Maria R and Rivera, Andres and Sano, Masaki and Severi, Mirko and Shanahan, Timothy M and Shao, Xuemei and Shi, Feng and Sigl, Michael and Smerdon, Jason E and Solomina, Olga N and Steig, Eric J and Stenni, Barbara and Thamban, Meloth and Trouet, Valerie and Turney, Chris SM and Umer, Mohammed and van Ommen, Tas and Verschuren, Dirk and Viau, Andre E and Villalba, Ricardo and Vinther, Bo M and von Gunten, Lucien and Wagner, Sebastian and Wahl, Eugene R and Wanner, Heinz and Werner, Johannes P and White, James WC and Yasue, Koh and Zorita, Eduardo},
  issn         = {1752-0894},
  journal      = {NATURE GEOSCIENCE},
  keyword      = {SIMULATIONS,RESOLUTION,CLIMATE,RECONSTRUCTIONS,STATISTICAL SIGNIFICANCE,NORTHERN-HEMISPHERE,ICE-AGE,LAST MILLENNIUM,EVOLUTION,CENTURIES},
  language     = {eng},
  number       = {5},
  pages        = {339--346},
  title        = {Continental-scale temperature variability during the past two millennia},
  url          = {http://dx.doi.org/10.1038/NGEO1797},
  volume       = {6},
  year         = {2013},
}

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